Add simple icons

Sometimes you don't have fonts that have a wide variety of specialized
icons. This commit adds a simple icon set

Author: EmilOhlsson

doc/litee.txt

@@ -185,9 +185,9 @@ lib/icons                                                          *litee-lib-ic
 The `icons` library defines and exports icon sets which plugin authors may use
 for a consistent experience. 
 
-Currently `codicons` and `nerd` and "default" icons are exported.
+Currently `codicons`, `simple`, `nerd` and `default` icons are exported.
 
-The "default" icon set only supplies the stock UTF-8 icons necessary to display
+The `default` icon set only supplies the stock UTF-8 icons necessary to display
 litee's UI such as indent guides and tree symbols.
 
 Users of this library can override the exported icon libraries during runtime to

lua/litee/lib/icons/init.lua

@@ -1,6 +1,6 @@
 local M = {}
 
--- alot of these are yoinked from:
+-- a lot of these are yoinked from:
 -- https://github.com/onsails/lspkind-nvim/blob/master/lua/lspkind/init.lua
 M.nerd = {
     Account         = '',
@@ -212,6 +212,77 @@ M.default = {
     Variable        = "V",
 }
 
+M.simple = {
+    Account         = "A",
+    Array           = "\\[\\]",
+    Bookmark        = "BM",
+    Boolean         = "bool",
+    Calendar        = 'cal',
+    Check           = 'x',
+    CheckAll        = 'xx',
+    Circle          = 'o',
+    CircleFilled    = 'O',
+    CirclePause     = 'P',
+    CircleSlash     = 'ø',
+    CircleStop      = 'stop',
+    Class           = "class",
+    Collapsed       = ">",
+    Color           = "color",
+    Comment         = 'c',
+    CommentExclaim  = 'c!',
+    Constant        = "c",
+    Constructor     = "C",
+    DiffAdded       = '+',
+    Enum            = "Ε",
+    EnumMember      = "Ε",
+    Event           = "e",
+    Expanded        = "v",
+    Field           = "f",
+    File            = "F",
+    Folder          = "D",
+    Function        = "fn",
+    GitBranch       = 'br',
+    GitCommit       = 'ci',
+    GitCompare      = 'cmp',
+    GitIssue        = 'I',
+    GitMerge        = 'M',
+    GitPullRequest  = 'PR',
+    GitRepo         = 'R',
+    History         = 'H',
+    IndentGuide     = " ",
+    Info            = 'i',
+    Interface       = "I",
+    Key             = "k",
+    Keyword         = "kw",
+    Method          = "m",
+    Module          = "M",
+    MultiComment    = '#',
+    Namespace       = "NS",
+    Notebook        = "NB",
+    Notification    = 'N',
+    Null            = "null",
+    Number          = "#",
+    Object          = "{}",
+    Operator        = "op",
+    Package         = "{}",
+    Pass            = 'y',
+    PassFilled      = 'yy',
+    Pencil          = 'e',
+    Property        = "P",
+    Reference       = "&",
+    RequestChanges  = '-',
+    Separator       = ".",
+    Space           = " ",
+    String          = "\"",
+    Struct          = "S",
+    Sync            = 's',
+    Text            = "\"",
+    TypeParameter   = "T",
+    Unit            = "U",
+    Value           = "v",
+    Variable        = "V",
+}
+
 M.icon_hls = {
     Array           = "LTConstant",
     Boolean         = "LTBoolean",